[PR PATCH] pymol: enable for musl, fix byte-compilation.

[ericonr <ericonr@users.noreply.github.com>]

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There is a new pull request by ericonr against master on the void-packages repository

https://github.com/ericonr/void-packages pymol
https://github.com/void-linux/void-packages/pull/25162

pymol: enable for musl, fix byte-compilation.
It doesn't segfault anymore :D 

However, it's doing something weird in linking:

```
$ pymol
Traceback (most recent call last):
  File "/usr/lib/python3.8/site-packages/pymol/__init__.py", line 64, in <module>
    import pymol
  File "/usr/lib/python3.8/site-packages/pymol/__init__.py", line 580, in <module>
    import pymol._cmd
ImportError: Error relocating /usr/lib/python3.8/site-packages/pymol/_cmd.so: backtrace_symbols: symbol not found
$ LD_PRELOAD=/lib/libexecinfo.so.1 pymol
 PyMOL(TM) Molecular Graphics System, Version 2.3.0.
 Copyright (c) Schrodinger, LLC.
 All Rights Reserved.
[...]
```

It found the symbol while linking (I guess?) but it somehow wasn't recorded.

A patch file from https://github.com/void-linux/void-packages/pull/25162.patch is attached

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From fb51ebb5712773be5d16d5e7feb12f4000dc8e0a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89rico=20Rolim?= <erico.erc@gmail.com>
Date: Mon, 28 Sep 2020 17:03:36 -0300
Subject: [PATCH] pymol: enable for musl, fix byte-compilation.

---
 srcpkgs/pymol/patches/musl.patch | 13 +++++++++++++
 srcpkgs/pymol/template           | 12 ++++++++----
 2 files changed, 21 insertions(+), 4 deletions(-)
 create mode 100644 srcpkgs/pymol/patches/musl.patch

diff --git a/srcpkgs/pymol/patches/musl.patch b/srcpkgs/pymol/patches/musl.patch
new file mode 100644
index 00000000000..a94d8235593
--- /dev/null
+++ b/srcpkgs/pymol/patches/musl.patch
@@ -0,0 +1,13 @@
+diff --git a/ov/src/ov_types.h b/ov/src/ov_types.h
+index 6d2ad80..11d1589 100644
+--- ov/src/ov_types.h
++++ ov/src/ov_types.h
+@@ -19,6 +19,8 @@ extern "C" {
+ #include <windows.h>
+ #endif
+ 
++#include <cstddef>
++
+   /* automatically detect 64-bit machines */
+ 
+ #ifndef OV_32_BIT
diff --git a/srcpkgs/pymol/template b/srcpkgs/pymol/template
index 466f6d09db0..426973109ec 100644
--- a/srcpkgs/pymol/template
+++ b/srcpkgs/pymol/template
@@ -1,7 +1,7 @@
 # Template file for 'pymol'
 pkgname=pymol
 version=2.3.0
-revision=3
+revision=4
 wrksrc=${pkgname}-open-source-${version}
 build_style="python3-module"
 hostmakedepends="python3"
@@ -18,9 +18,10 @@ checksum="62aa21fafd1db805c876f89466e47513809f8198395e1f00a5f5cc40d6f40ed0
  0ea81faaf336becc669a193777d0dca55475d303d1236b57df25cf67ff7c2bcd"
 skip_extraction="${pkgname}.png"
 
-case $XBPS_TARGET_MACHINE in
-	*-musl) broken="segfaults on start";;
-esac
+if [ "$XBPS_TARGET_LIBC" = musl ]; then
+	makedepends+=" libexecinfo-devel"
+	LDFLAGS="-lexecinfo"
+fi
 
 # TODO: make it use pkg-config, if possible
 CXXFLAGS="-I${XBPS_CROSS_BASE}/${py3_inc} -I${XBPS_CROSS_BASE}/usr/include/libxml2
@@ -30,4 +31,7 @@ post_install() {
 	vlicense LICENSE
 	vinstall "${FILESDIR}/${pkgname}.desktop" 755 usr/share/applications
 	vinstall "${XBPS_SRCDISTDIR}/${pkgname}-${version}/${pkgname}.png" 644 usr/share/pixmaps
+
+	# these tests are written for python2
+	rm -r "${DESTDIR}/${py3_sitelib}/pymol/pymol_path/test"
 }